Mattithiah = "gift of Jehovah"
1) a Levite who presided over the offerings
2) a Levite appointed by David to minister in the musical service
before the ark
3) one of the family of Nebo who had a foreign wife in the time of Ezra
4) one of the men who stood at the right hand of Ezra when he read
the law to the people

Brown-Driver-Briggs (Old Testament Hebrew-English Lexicon)

From H4991 and H3050; gift of Jah; Mattithjah, the name of four Israelites:Mattithiah.